Which design feature was specifically added to the P-51 Mustang fighter aircraft that dramatically extended its range and made it capable of escorting bombers all the way to Berlin during WWII?

Throughout military history, aircraft design has evolved dramatically to meet specific combat requirements. From the canvas-covered biplanes of WWI to today's stealth fighters, each design element serves a purpose. This poll tests your knowledge of how military product design has adapted to battlefield needs, showing how engineering solutions reflect tactical problems. Do you know which famous design features were revolutionary responses to combat challenges?

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The laminar flow wing design
The bubble canopy for better visibility
The Rolls-Royce Merlin engine replacement
The addition of external drop tanks